Automatic check-valve for inflammable gases.



H. B. MIGLIAVACOA. AUTOMATIC CHECK VALVE FOR INFLAMMABLE GASES. APYL IOATION IILBD mm: 12, 1911.

1,030,91 1. Patented July 2, 1912.

an ueutoz '19. M 'Z' WMWO 6403/ 9 HENRY B. MIGLIAVACCA, OF NAPA, CALIFORNIA.

AUTOMATIC CHECK-VALVE FOR INFLAMMABLE GASES.

Specification of Letters Patent.

Patented Jnly 2, 191 2.

Application filed June 12. 1911. Serial No. 632,686.

To all whom it may concern:

Be it linown that I HENRY l3. \IIGLIA- vAccA, a. citizen of the Ilnited States, residing at Napa, in the. county of Napa and State of California. have invented certain new and useful Improvements in Automatic (heck-Valves tor Intlammable (lases; and I do hereby declare the following to be a full, clear, and exact description of the iiivention, such as will enable others skilled in the art to which it appertains to make and use the same. reference being hereby made to th accompanying drawings, forming part of this specification.

This invention relates to a safety gas valve, and is adapted to be placed between the service pipe into the building and the gas meter and to automatically, cut otl' the How ol gas from the service pipe to the gas lneter when the temperature surrounding the valve shall have been raised to a predeterminet 'legrce, either by tire or other heat-prodm mg causes.

As these valves may not be operated for a great. many years, it is essential that they shall be so constructed as to be able to remain for years in an inactive. condition and yet be certain to operate when they are suiticiently heated. I urthermore. it is essential that these valves. be co|n} osed of very few parts and not liable to get. out otorder or fail to work when desired.

Ily my invention I have produced a valve whi h fulfils all of the above requirements and which, in addition, is very cheap to construct.

teterring to the drawings wherein I show in central longitudinal section the preferred form of my invention, and wherein the Same. part is designated by the same reference characters wherever it occurs A designates a. chamber having an inlet opening I) threaded to receive the service pipe, and an outlet Il ir ts side threaded for connection to the g. meter. In the lower portion of the chamber I provide the valve seat C which is l'ormed by a Hanged ring extending); inwardly from the walls of the chamber. .\lounted on top 01 the chau'ibcr is the cap I which has the centrally located extension K. into which extends the stem F, which 'tll' ries at. its lower end the heavy metallic. ball I). The ball It is of such a size as to act as a valve when in contact with the 'alve seat and close the passage from the inlet. I to the outlet I), the weight of the ball being sufficient. to overcome the gas pressure beneath the same.

H is a spring which I preferably interpose between the top of the ball B and the lower side of the cap I. This spring is for the purpose of aiding the movement of the hall to its seat. but is not essential to the assembling of the device. In operation the cap I is removed from the top of the chamber A. the stem I is inserted in the extension K after the spring II has been placed in position and the end of the stem forced to the bottom of the extension. Metal Ur which will lose at the temperature at which it is desired to have the valve operate is now run into the extension. tilling the same, whereupon the stem will be firmly held in the extension and the ball held in its upper position. The cap is now secured in place on the chamber. and the device is ready to operate whenever sullicient heat is generated around the same to fuse the metal G.

In the operation of the device as soon as the metal G is fused the ball moves down onto its seat. Should however the spring have weakened by remaining so long under tension or have brokem this will not interfere with the operation of the valve, as the ball itsclt has sutlicient weight to move to its seat without the assistance of a spring. The stem extendingup into the extension guides the ball to its seat. As the valve stem is of such a length as to always remain in the extension K, the stem will act to prevent any rotation or material movement of the ball on its seat.

I realize that considerable variation is possible in the details of construction and arrangement of parts without departing from the spirit ot my invention, and I therefore do not. intend to limit myself to the specific form shown and described.

4 Having thus described my invention what I claim as new and desire to secure by Let ters Patent is:

I. In an automatic check valve for inflammable gases and the like, the combination with a valve chamber provided with inletand outlet openings. the outlet openiu being located in the side and the inlet opening, in the bottom of the chamber, a valve seat. located in the chamber above the inlet opening, a cap for the top of the chamber provided with an extensionextendingupwardly from the central portion thereof and closed al its upper end, a ball valve of weight sullilQDil lo gent. iioul on the valve seat against iho pressure flowing through the inlet i opening, a Stem extending upwardly from the hall valve and into the extension of the (up, and a fusible metal lining interposed hetyveon. the cap and the "alve stem and SW rounding a substantial portion of the long h. of said stem whereby such stem is united to ihe interior of ihe extension. I

In a nulmnatic check valve for inflamund the. like the comhiimiion a valve 1 )rJ-i" pm. with inlet outlet op the outlet do and fihe inlet op w n.

and 3 located in the in Lilo holziom tho a'rilambi, loom t upper end, a hull who of \voighl; Sllfil 'ieni to sew ils-ol'f on the? vulvu .Liiil against 1m: flowing through the inlet a stem extending upwardly from waning,

. the ball valve and into ihe extension of tho cap, a fusible metal lining interposed tween the can and the valvo stem and 11- i'ounding a siibstanf-ial portion of the leiig'ih of sail tern Where o such stem is united to z the llllAEl'lUl of the. extension, and a sgrin interposed between (ho clip and the hoiiy'o i i the valve and surrounding the valve otem.

In testimony whereof, l lfilX my si matm'e two 'Wltn es l1 ENRIY B. MiGL-IA V AC? 

